Everybody knows when there birthday is. We live our lifes knowing the day, the time, the month, and the year that we were born. But, we live our lives never knowing our death date. Never knowing when it, being ourselves, will be over. But what if we did? In Cassies world everybody gets a date written on there arm. This date represents the time they were born. People call it "an experation date". When cassie finds out her experation dates, she stays cautious on that day. Nobody in history has ever changed there date. Can she?